What is the difference between a medical complication and medical negligence?

Patients are often told that what happened to them was "a known complication". Sometimes that is exactly right. Sometimes it is only part of the story. Dr Chee, who worked as a medical officer before practising law, is often asked to explain the difference. This guide sets it out.

What is a complication?

A complication is an unwanted outcome that is a recognised risk of a treatment or procedure. Examples: bleeding after surgery, infection, nerve injury during certain operations, a reaction to a drug, or a perforation during an endoscopy. Complications can happen to careful, skilled doctors. Their existence is the reason consent forms list risks.

What is negligence?

Negligence in the legal sense has several parts:

1. the doctor owed the patient a duty of care (usually obvious);
2. the doctor's care fell below the required standard;
3. that breach caused the harm; and
4. the harm is a kind the law compensates.

The key is the standard of care, not the outcome.

How do Malaysian courts decide the standard of care?

For diagnosis and treatment, the Federal Court in Zulhasnimar (2017) confirmed that Malaysian courts apply the Bolam test: a doctor is not negligent if they acted in accordance with a practice accepted as proper by a responsible body of medical opinion in that field. This is qualified by Bolitho: the court must be satisfied that the supporting opinion has a logical basis. See our guides on the Bolam test and Zulhasnimar.

For advice about risks (consent), the Federal Court in Foo Fio Na v Dr Soo Fook Mun (2007) adopted a different approach: a doctor must tell the patient of material risks, meaning risks a reasonable person in the patient's position would consider significant, or that the doctor knows or should know this particular patient would consider significant. See our guide on informed consent.

When can a complication also involve negligence?

A complication and negligence are not opposites. Common overlaps include:

• The risk was not explained. A known complication occurs, but the patient was never told about it and would have chosen differently. That may be a consent claim.
• The complication was caused by poor technique. For example, damage to a structure that a careful surgeon would have identified and protected. Whether this is negligence depends on expert evidence about what reasonable practice requires.
• The complication was recognised or treated too late. A bleed or leak may be a known risk, but failing to notice it on observation charts, or delaying return to theatre, can be negligent.
• The procedure should not have been done. If the treatment was not indicated or a safer alternative was clearly preferable, the decision itself may be questioned.

Have a question about your own situation? Ask on WhatsApp

How can I tell which applies to me?

It is difficult without the records. Practical steps:

1. Request the full records, not just a report. See how to request medical records.
2. Look at the consent form: was the complication listed? Do you remember a discussion?
3. Write down the timeline: when symptoms began and when they were acted on. Many claims turn on delay.
4. Get an independent review: a lawyer with medical training can identify the questions, and a specialist expert may be needed. See do I need an independent doctor's report?

Examples

• A patient develops a wound infection after surgery, recognised promptly and treated with antibiotics. Likely a complication, not negligence.
• The same infection is documented on charts as fever and a red wound for three days with no doctor informed, and the patient develops sepsis. The infection is a complication; the delay may be negligence.
• A patient suffers a nerve injury after an operation where that injury is a recognised risk, but the risk was never mentioned and the operation was elective. There may be a consent issue even if the surgery itself was well performed.

These are illustrations only; real cases depend on detailed evidence.

Common mistakes: accepting "known complication" as the end of the inquiry, or assuming that any bad outcome must be someone's fault.

When to speak to a lawyer

Speak to a lawyer if you were told your injury was a complication but the explanation does not fit the timeline, if risks were not discussed, or if the harm is serious. A doctor-turned-lawyer can read the records and tell you plainly what they show. You can contact us for an initial discussion; every case depends on its facts.

Frequently asked questions

The hospital says it was a known complication. Does that end the matter?

No. It may be correct, but it is also worth asking whether the risk was explained and whether the complication was recognised and treated promptly.

If the risk was on the consent form, can I still claim?

Possibly. A listed risk helps show consent, but not whether the procedure was done with reasonable care or the complication managed properly.

Who decides whether it was negligence?

Ultimately the court, based on evidence including independent expert opinion.

Is a rare complication more likely to be negligence?

Not necessarily. Rarity alone does not show negligence, though very rare events may prompt closer questions about technique.

Is there a deadline to decide?

Yes. Strict time limits apply under Malaysian law, so seek advice early.

Sources & fact check

Legal points in this article were checked against the primary sources below. The law can change; this is general information, not legal advice.

1. Zulhasnimar bt Hasan Basri & Anor v Dr Kuppu Velumani P & Ors [2017] 5 MLJ 438 (Federal Court) (reported judgment)
2. Foo Fio Na v Dr Soo Fook Mun & Anor [2007] 1 MLJ 593 (Federal Court) (reported judgment)
3. Laws of Malaysia Online, Attorney General's Chambers (official text of Acts)

Fact-checked on 17 Oct 2026